generate crud endpoints for Swagger/OpenAPI

crudOpenApiEndpoints.js

let R = require('ramda');

const up = (s) => s[0].toUpperCase() + s.substring(1).replace(/\-(\w)/, (match, letter) => letter.toUpperCase());

// JSON.stringify(crudOpenApiEndpoints({ single: 'app' }))
function crudOpenApiEndpoints ({ single, plural = single + 's', id = 'id', type = 'integer' }) {
  let $ref = `#/definitions/${up(single)}`;
  let resp = (schema) => ({ description: 'OK', schema });
  let responses = { 204: resp({}) }; // empty non-GET response
  let idPar = { name: id, in: 'path', required: true, type };
  let bodyPar = { name: single, in: 'body', required: true, schema: { $ref } };
  return {
    [`/${plural}`]: {
      get: {
        responses: {
          200: resp({ type: 'array', items: { $ref } }), // { $ref: `#/definitions/${up(plural)}` }
        },
      },
      post: {
        parameters: [bodyPar],
        responses: {
          200: resp({
            type: 'object',
            properties: {
              [single]: {
                $ref: `#/definitions/${up(single)}`,
              },
            },
          }),
        },
      },
    },
    [`/${plural}/{id}`]: {
      get: {
        parameters: [idPar],
        responses: {
          200: resp({ $ref }),
        },
      },
      delete: {
        parameters: [idPar],
        responses,
      },
      put: {
        parameters: [idPar, bodyPar],
        responses,
      },
      patch: {
        parameters: [idPar, bodyPar], // technically need to strip `required`!
        responses,
      },
    },
  };
}

const renameBy = R.curry((fn, obj) => R.pipe(R.toPairs, R.map(R.adjust(fn, 0)), R.fromPairs)(obj));

/*
// use in batch:
var info = {
  customer: { id: 'integer', name: 'string', address: 'string', phone: 'string' },
  product: { id: 'integer', name: 'product', price: 'number' },
  invoice: { id: 'integer', customer_id: 'integer', dicount: 'number', total: 'number' },
  'invoice-item': { id: 'integer', invoice_id: 'integer', product_id: 'integer', quantity: 'number' },
};
// var makeOptional = R.omit(['required']);
var singles = R.pipe(R.map((properties) => ({ type: 'object', properties })), renameBy(up))(info);
// var plurals = R.pipe(R.keys, R.map((k) => [k+'s', { type: 'array', items: { $ref: '#/definitions/'+k } }]), R.fromPairs)(singles);
// var definitions = R.merge(singles, plurals);
var definitions = singles;
R.pipe(
  R.mapObjIndexed((o, single) => crudOpenApiEndpoints({ single, type: o.id })),
  R.mergeAll,
  R.values,
  R.mergeAll,
  (paths) => ({ swagger: '2.0', info: { title: 'crud', version: '0.0.01' }, paths, definitions }),
  JSON.stringify
)(info)
*/